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Stepping Numbers

Given N and M find all stepping numbers in range N to M

The stepping number:

A number is called as a stepping number if the adjacent digits have a difference of 1.
e.g 123 is stepping number, but 358 is not a stepping number


N = 10, M = 20
all stepping numbers are 10 , 12 

Return the numbers in sorted order.

NOTE: You only need to implement the given function. Do not read input, instead use the arguments to the function. Do not print the output, instead return values as specified. Still have a doubt? Checkout Sample Codes for more details.
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